6.
A minimal scraping script
 What did we just do?
 we created a new Casper instance
 we started it and opened http://casperjs.org/
 once the page has been loaded, we asked to print
the title of that webpage (the content of its <title>
tag)
 then we opened another url, http://phantomjs.org/
 once the new page has been loaded, we asked to
print its title too
 we executed the whole process

13.
Understanding evaluate()
 Think of the evaluate() method as a gate between the CasperJS environment and the
one of the page you have opened;
 Every time you pass a closure to evaluate(), you’re entering the page and execute code
as if you were using the browser console.